Control method for a variable displacement refrigerant compressor in a high-efficiency AC system
A compressor and displacement technology, which is applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problem of high cost
Inactive Publication Date: 2011-05-25
MAHLE INT GMBH
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Problems solved by technology
However, the use of electronically controlled variable displacement compressors often results in higher overall system costs due to the more expensive modulating control valves and required control electronics
Method used
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[0008] The present invention recognizes that by combining a pneumatically controlled (or pneumatically controlled) variable displacement compressor, such as that shown and described in U.S. Patent No. 4,428,718 to Skinner et al., with a compressor clutch cycle control ( or control) in combination can achieve the fuel efficiency benefits described in the above-mentioned US Patent No. 6,293,116 to Forrest et al. This compressor clutch cycle control comes into play when cascading reheat to achieve the desired air discharge temperature. Pneumatically controlled variable displacement compressors are cheaper to manufacture than electrically controlled variable displacement compressors, and the control electronics required to achieve clutch cycle control are simpler and less expensive than those with traditional electronically controlled displacement, reducing system the cost of. Typically, of course, a pneumatically controlled variable displacement compressor cannot be cycled (or t...
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The invention relates to a control method for a variable displacement refrigerant compressor in a high-efficiency AC system. The invention provides an operation method for an air conditioning system, which adopts an air conditioning system; the system comprises a pneumatically-controlled variable displacement compressor and a compressor clutch that is selectively cycled on and off to minimize series re-heating of conditioned air. Conditioned air is discharged after passing through an evaporator core, and a target value for the evaporator outlet air temperature is determined based on the desired air discharge temperature. The compressor clutch is cycled off when the evaporator outlet air temperature falls below the target value by at least a calibrated amount, and is thereafter cycled on again when the evaporator outlet air temperature rises above the target value. The target value is preferably biased to prevent compressor operation when the desired air discharge temperature exceeds outside air temperature by at least a calibrated amount and to prevent the relative humidity in the air-conditioned space from rising above a desired level.
Description
technical field [0001] The present invention relates to an automotive air conditioning system in which the capacity of a refrigerant compressor is controlled for high efficiency, and more particularly to a variable displacement refrigerant compressor used in such an air conditioning system ability control method. Background technique [0002] Studies of vehicle fuel efficiency have demonstrated that conventional air conditioning systems with fixed-displacement compressors that cycle intermittently in the usual fashion can address the annual consumption of approximately 25 gallons of gasoline per vehicle. As described in U.S. Patent No. 6,293,116 to Forrest et al., air conditioning efficiency can be significantly improved by adjusting compressor capacity in such a way that excessive dehumidification is eliminated and the treated (or conditioned) The series reheating (or series reheating) of the air is minimized. However, the evaporator is used to adjust the capacity of the ...
Claims
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IPC IPC(8): F24F11/00F25B49/02B60H1/32
CPCB60H1/00835B60H1/00735B60H2001/3261B60H2001/3245B60H2001/3275B60H1/3211
Inventor P·S·卡德尔M·J·齐马
Owner MAHLE INT GMBH